8, 2...4...6...?, 12, 2...4...6...8...10...?, 10, 2...4...6...8...?, 14, 2...4...6...8...10...12...?, 4, 2...?, 16, 2...4...6...8...10...12...14...?, 18, 2...4...6...8...10...12...14...16...?, 20, 2...4...6...8...10...12...14...16...18...?, 6, 2...4...?

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